The Bruins ' losing streak reached six on Monday night.
Boston fell 2-1 in overtime to the Flames after Calgary 's struggling power play came to light at the right time.
Connor Zary scored 1:53 into overtime on a backhand shot that appeared to deflect off a defender's stick and past Jeremy Swayman .
Boston jumped out to a 1-0 lead in the first when Andrew Peeke pushed the puck by Dustin Wolf with 1:54 left in the period. The Flames challenged for goaltender interference but the call on the ice stood.
Blake Coleman tied the game at 1-1 in the second with a shot from the high slot that beat Swayman.
Neither team could score in the third, but the penalty issues continued for Boston when Jonathan Aspirot was called for high-sticking Coleman at the end of the period that gave the Flames the man-advantage going into overtime.
The Bruins had a nice scoring chance thanks to Pavel Zacha and Nikita Zadorov behind him with the rebound, but neither could find the back of the net.
Zary called game for the Flames , who are 7-3-0 in their last 10 games.
The Bruins' road trip continues with a game against the Edmonton Oilers on New Year's Eve.
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